Have been made researches on rodents and the studies dicovered negative effects o animal foetuses,in case when the animals were fed with a large amount of substances contained in color hair product.But was considered that this doesn't have the same effect in case of skin applied.
Other studies on hair dye have shown that only a small percentage of hair dye is actually absorbed through the scalp and gets into the body.But nowadays manufacturers have stopped making hair dye with harm ingredients.
While the absorption through the skin is minimal,the larger danger is the fumes,which can be inhaled in greater amounts (dye hair contain ammonia which has a strong chemical fume).
Is more recommend highlighting or low-lighting your hair when the dye is encased in foil and doesn't come into direct contact with your skin or release fumes in aer.
A chemical free vegetable dye is also another good alternative.
Even though there has not been any evidence of hair dye causing birth defects,is not sure of being safety.and is recommended to not use hair dye in the first trimester of the pregnancy.
The first trimester is when all of your baby's major organs are forming.your doctor may recommend postponing coloring your hair until you are in your second trimester or avoiding hair coloring all together.
Safety Tips:
-avoid coloring your hair during the first trimester
-choose a hair dye that will stay on your scalp for the least amount of time as possible
-where gloves when you color your hair
-highlight your hair
-use natural hair dye
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